Clues on how to fix these errors??

Question

I am not sure if I am should post all of my code or not, but here are the errors I keep getting and I do not know how to over come them. Also I know I should be able to build the frame and do the calculations in the the same program, but I until I get these errors worked out I can't do that. Any suggestions?
doMort.java [63:1] float cannot be dereferenced
mortgage= Float.parseFloat(mortgage.getText());
^
doMort.java [64:1] float cannot be dereferenced
interest = Float.parseFloat(interest.getText());
^
doMort.java [65:1] float cannot be dereferenced
length = Float.parseFloat(length.getText());
^
doMort.java [77:1] pow(double,double) in java.lang.Math cannot be applied to (float)
double temp1 = (1-Math.pow(1+r)-t);
^
doMort.java [78:1] possible loss of precision
found : double
required: float
float temp2 = r/temp1;
^
5 errors
Errors compiling doMort.

Answer 1

Hi.
You probably do not need to post all your code.
The first three errors are basically the same - let's look at the first one:
you have a variable called mortgage. You declared it to be of some type which is
not float, and you try to put a float value into it.
the fourth problem is that you are trying to use the method Math.pow, which needs
to receive two double arguments. However, you only give it one argument which is float. The
compiler doesn't like that.
The last warning tells you that you are in danger of getting a wrong answer, since you are trying
to calculate the r/temp1 - which gives a result of type double. You take this result and put it into
a variable that's declared float - and since a double can hold more precision than a float- you might
lose this precision and hence get a wrong answer there.
Nimo.